Question

Folosind proprietatile de asociativitate si comutativitate ale nr. rationale calculati:
320 supra 321 - 1 supra 7 + 1 supra 321 - 6 supra 7

Answer 1

$\frac{320}{321}- \frac{1}{7}+ \frac{1}{321}- \frac{6}{7}=( \frac{320}{321}+ \frac{1}{321})-( \frac{1}{7}+ \frac{6}{7} )= \frac{321}{321}- \frac{7}{7}=1-1=0$